... embracing a new future Composite board of the specifications of the:thickness: color plate thickness(mm)0.3-0.8 ... 950,1130 roof board: 950,980 characteristics of the color composite sandwich plate :high strength,physical . corrosion resistance , ... big span steel structure roofing ,metope of house and external decoration . it has light weight ,high strength,colourful ,constructionconvenient ,earthquake ...